package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

@Component
public class RefreshTokenInterceptor implements HandlerInterceptor {


    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //1.获取请求头的token

        String token = request.getHeader("Authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }

        //2.基于Token的用户

        String key = "login:token:" + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        //3.判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }

        //5.hash 转 DTO

        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //6.存在，保存到ThreadLocal

        UserHolder.saveUser(userDTO);
        //7. 刷新token有效期
        stringRedisTemplate.expire(key, LOGIN_USER_TTL, TimeUnit.SECONDS);
        //8.放行
        return true;
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
